What order should I add these fish to a new tank?

Been doing research on stocking my new 180g tank, but haven't come across good information in regards to what order I should add fish..
This is what I'd like to have, and I imagine I will be picking up most of these fish as juvenilles.

3-4 Ropefish*
1 Black Ghost Knife
6-10 Dennison Barbs
4-5 Australian Rainbowfish
2~ Large breed plecos
3-4 African Butterfly Fish
Leopard Leaf Fish
??? Catfish

 

What is a ??? catfish? Don't know much about most of these, but I would say black ghost knife later on and the ropefish earlier. Hopefully someone else can fill in the gaps.

 

What is a ??? catfish? Don't know much about most of these, but I would say black ghost knife later on and the ropefish earlier. Hopefully someone else can fill in the gaps.

It means I want some sort of catfish, but haven't decided on the type yet
Possibly thinking sydontis but I'm still up in the air

 

I LOVE featherfin synodontis catfish, go for it.

 

I LOVE featherfin synodontis catfish, go for it.

Yeah I definitely like the look, they seem super unique..

I've never owned predatory fish before so I'm not super familiar with proper techniques in adding everything in.. I assume I'd want to make sure the peaceful guys in the tank are all big enough to not be snacks for BKG/Ropefish before I add the predators in? I see the sydontis can get up to 11", when I go to purchase from my LFS should I expect them to be able to get them in around 3-4"?

 

yup. I bought one for a 10 gallon, thinking it was a black spotted. luckily, I know someone with a 30 and 55 gallon cichlid tank. apparently now it is the size of the cichlids, which are convicts and similar sized fish.